The principle of attacking on the enemy's flank has been employed in warfare for as long as war has been fought. Vast armies attack in formation from the flank, as main artillery engages frontal. The predatory behaviour depicted by a pair of muggers in the street will often employ the pincer approach where one subject will distract frontal as the other suckers the unsuspecting target from the flank. The tactic of "In-Quartata" from fencing employs flanking from an offensively-defensive perspective, where one combatant will move out of line from an oncoming assault whilst simultaneously attacking on the flank.